Nikola tksla



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Patented June 8, 1897.

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BEST AVNLABbE (No Model.)

. N. T-ESLA APPARATUS FOR PRODUOING'GURRENTS OF HIGH FREQUENCY.

mm-ssss BEST AVAILABLE COP.

UNITED STATE PATENT OF-FI A PAR U F R PROD CING QQRRENIS'QJEH QH FBEQHF-N SPECIFICATION aimin m of Letters e t m). 583,953, t1a d June'S, 1897.

Application filed October 19,1896.. se ria it. 609,292 (to tan 1 1///' Ii'f lfliil f1 [VIII/3'! IIIJII'I'I'IIQ', i lie it known that l, .\'|KoI..\-'lr;sli.-\, acitizen ot'the l' nitedStates,residingatNew York, in the county and State of New York, have invented certain newanduset'ul improvements in Apparatus for Producing Currents-of High l re'quency, of which thet'ollowing' is speciti eation, reference being had tojthe tll'{t\\' ilt8 accompanying .and forming apart' of'the same.

ratus for the conversion of electrical currents of ordinary charactcr-s uch, for instance, as

continuous or alterlnttinginto cnrrcnts very high frequency'and potential; 1

The improvmnent is ap 'ilicablc generally to apparatus of the kind heretofore invented by me and' morc particularly described in United States Letters Patent granted to me on Septtitllbcl lfif, l 't i, o. 5 38,17 3; but in the d0 scription ot' the invention which follows the illustration is con lined to a form of apparatus designed for converting a continuous or direct current into one of high frequency. In the several forms of apparatus for this purpose which l have devised and heretofore desrribed l have employed a circuit of high selfinduetion connectedwith thcmaius from asnitabbsource of current and containing some form ot circuit-controller for periodically interrupting it. -Around the break or point of interrupt-ionl have arranged a condenser, in to which the circuit discharges when interrupted, and this condenser is in turn made to discharge through a circuit containing the primary of a transformer, and'of such character that the condcnser-discharge will be in the form of an extremely rapid snot-cs sion of impulses.

Now in orderto secure in an apparatus of this kind as high frequency as possible and the advantages resulting therefrom I subdivide the condenser necessary for storing the energy required into integral parts or provide independent condensers, and employ means for eharging'said condensers in multiple-amt d harging them in 'tt'it through the pri- :nai'y ot the transformer} To Mitllit this re- Illi-\\l1llntll undulyc mpli ating the appa- The invention upon whiehiny present application is based is an improvement in appa-' ratus is a. matter of; very considerable difficulty, but lhave accomplished it by means of the appz'tratus which I shall nowproceed to describe byretcrcimc to the drawings.

tus whichI cmploy,"and Fig. 2' is a diagram the motorf Above these is the transformer, composed, essentially; of a primary G and a secondaryl These devices are intended to be iiieloscd'in a suitable box or case, and may be very greatly moditiedin construction and relativearrangement. Thecireuit-controller, however, should conform in general princiscribed in so far as may be necessary to secure the operation pointed out.

Referring now to Fig. 2, Li. designate the tween which a circuit is formed, including the self-induction coils F l and the circuitcontroller C. A switch (I may be employed to bring either or both of the coils 1- 1 'into this circuit, asmay be desired.

lated plates or segments, upon which the positive and negative brushes bear, and these sets or'classes, first, the plates m for what may be considered as the positive brushes 1) l)"in one row, electrically connected together, and the corresponding plates it for what may similarly be considered as the negative brushes E I in the other row; second, the plates o, which lie in both rows, and hence are conveniently made in single pieces extending across the controller, and, third, the idle or spacing plates p, which are interposed in each row between the other two sets. The angle between adjacent plates of the same a set. is equal ,to the angle of displacement bet ween adjacent brushes of the same sign, and

The brush D of one set is connected with one ple of construction to that hereinafter de-' mains from a suitable source of supply, bc-' 'lhc circuit-controller is-built up of iu'su plates may be considered as bt' longing to three Figure 1 is a side elevationot' the apparae I" F, are self-induction coils placed beside l t l i main through the coils F, and each one of the brushes of the same set is connected to one of theterminalsof the condensersMN, re-

spectively. Similarly the brush E of the other set oftbrushes is connected tothe opposite main and each of the brushes of said set to the opposite condenser terminals through the t primaryorrstrands of a;-'pri1na1" (h; In the diagram, Fig. 2, I havelshown but tw0brushe in each set and twocon ensers, but more than this n umber may be used, the same plan of connections shown'and described being to- ;.1 In .thep'osition of the parts shown in F g,

2, in which two positive and two negative; brushes are shown, the brushes are bearing onplatcs m m andnn. j Cqnsequentlythe ei r; cuit throngh thecoils-l l isthrough the eondenser-s in multiplc, -,and,assuming thatfen:

orgy has been; )red ,in;

densc'rs willtliu; bc'charg I movement oflthe'controlle plates orb'ru. ies the latter arc'shit'ted. across the idle, or.i cpac-' iug plates 1 onto thejlong or cross conne'ctcd.

plates 0 two results followzjfihe mains .are

short-eircuited through the coilsF F,;which' therefore store energy, while the condensers are connected in series through theprimary coil or coils (1 These actions are repeated by the further. movcn'ientof the controller,

the condensers being cha rgcd in parallel when the brushes are on plates in n and discharged 'in series when the brushes pass onto plates n; .The motor may be run by an independent 35 source or bycurrent derived from thcrnrains, and the apparatus may be employed to supply current for anysuitablc devices S '1, connected with the secondary coil II.

As stated above, the specific construction of the circuit-controller may be very greatly varied without departure from the invention. In the drawings the plates are assumed to be associated in the form of a cylinder which revolves with respect to brushes bearing on its periphery; but it will be understood that this is merely a typical illustration of any form of terminals or contacts and conducto1'S,'\vllCillcl rota-ry'orreciprocating, which constitute a circnit-controllercapable of effecting the same result.

BEST AVAlLABLE (I-OP.

The advantages resulting from the subdivision ofthe condenser or the employment of a plurality of condensers are mainly that a high frequency is obtainable in apparatus of any size; that the current of d ischargc through tlie'sliding contacts is greatly reduced and injuryto such contacts thereby avoided and a-ig rcat saving inwirein the SttCOlltltU) cf fcctcd,

\\'hat I 'claim is-e 1.- Inan apparatus of the kind described,

[thecombination, with a set of contacts, one oft-which is adapted for connection with one ofthe mains from. a source of current, and each ot which is connected to one of the terjminals of ;a series oi. condensers, and a second set of contacts similarly connected to the itijpnnsltd main and condenser terminals, re-

spcc tivcly, of-clectrically-connected plates or cgmentsupon-which the contacts of the first ct;bcar, siniilarly-connected plates upon \vl|iclr ,tliecontactsof.thc second set bear,

.a nd iolatcd plates common tothe two sets flot',, con tacts, the said plates being arranged in -th,c manncr described, whereby the condenscrsi will be alternattj-ly charged in multiple and discharged in series, as setforth.

- ln anapparatus of the kiml-des -ribcd, the combination with a set of positive brushes, one-oi which is adapted for connection with one of the mains from asource of current, and eachot which is connected to one of the terminals of asericsof condensers, and nega- 

